The push method observes the current top node, constructs a new node to be pushed on the stack, and then, if the topmost node has not changed since the initial observation, installs the new node.
push方法观察当前最顶的节点，构建一个新节点放在堆栈上，然后，如果最顶端的节点在初始观察之后没有变化，那么就安装新节点。
Observation in vivo showed that pacemaking in SA node and conducting in AV node area were inhibited.
在整体动物实验中，观察到对窦房结起搏活动、房室传导的抑制。
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